JPS6160359B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an annular moving grate type heat exchange device used for heat exchange between a hot mass and a cooling gas.

In general, this type of heat exchange device has a structure as shown in FIGS. 1 and 2, in which an annular movable grate 1 is formed by connecting a large number of pallets T that run in an annular space cut off from the outside air. A cooling chamber 5a is loaded with high-temperature lumps 2 such as red-hot coke from the feed hopper 3 to a certain layer thickness, and is divided into several chambers with a gas sealing mechanism 4 in the annular space. 5b, 5c
The files will be migrated sequentially. Each of the divided cooling chambers has a wind box 6 and a hood 7, and each chamber is connected in series through a duct 8, through which cooling gas 9 is forced into the chamber where the temperature of the lumps is low. from the bottom to the higher chamber and across the agglomerate layer from the bottom to the top. After this cooling gas 9 comes into contact with the lumps 2 in each chamber and receives heat, the cooling gas 9 is sent to the waste heat boiler 1.
1 to generate steam, which radiates heat and is recycled and used again as a cooling gas 9 for the lumps 2. On the other hand, the cooled lumps 2 are discharged from the ore discharge section onto the grate 1 into the ore discharge hopper 12.

Therefore, the atmospheric pressure of the annular moving grate 1 is high in the 3 portions of the ore feed hopper and low in the 12 portions of the ore discharge hopper. , 5c, the cooling gas 9 is sequentially passed in series while maintaining a certain pressure difference. However, in such a gas flow state, when charging the lumps 2 into the ore feeding hopper 3 or discharging the lumps 2 from the ore discharge hopper 12, the lids or dampers attached to these hoppers 3 and 12 When 13a and 13b are opened, phenomena such as atmospheric gas flowing out of the ore feeding section and ore discharging section or air intrusion occur, causing pressure fluctuations, and this effect sequentially spreads to the air pressure in each cooling chamber. However, there was a serious drawback in that the amount of gas passing through each chamber varied greatly, leading to problems such as an increase in the amount of gas leaking between the chambers, uneven cooling, or a decrease in the cooling effect.

This phenomenon tended to increase as the particle size of the agglomerates 2 became larger, as it became easier for gas to pass between the agglomerate particles.

Furthermore, when the lumps 2 are red-hot coke, combustible gases such as CO or toxic gases are generated in the cooling gas 9, and this is dissipated into the atmosphere or deflagration occurs due to air entering the equipment. There were also drawbacks, such as the risk of inadequate extinguishing.

In view of the above-mentioned drawbacks of the conventional devices, the present invention aims to reduce the pressure in the cooling gas system forming the moving grate atmosphere.
The present invention proposes a device of this type that can maintain a constant flow rate regardless of the charging and discharging of lumps, stabilize the operation of the device, increase the efficiency of movement, and ensure operational safety.

The gist of the present invention is that hot lumps such as red-hot coke are placed on an annular moving grate made up of a number of consecutive pallets that run in an annular space that is cut off from the outside air. In the annular moving grate type heat exchange device, wherein the ore is loaded in a constant layer thickness from the ore feed hopper, and the agglomerates cooled by the cooling gas that crosses the layer are discharged from the ore discharge hopper. An auxiliary hopper for temporarily storing the agglomerates is attached to each of the ore feed hopper and the ore discharge hopper, and airtight dampers are provided at the agglomerate loading and unloading ports of the auxiliary hoppers, respectively. A first regulating valve provided in a piping system connecting an auxiliary hopper attached to the ore hopper and an inert gas supply source, and a second regulating valve provided in a piping system connecting the auxiliary hopper and the exhaust gas treatment device. , a first gas pressure regulator that detects the internal pressure of the auxiliary hopper and the internal pressure of the ore feed hopper and controls the first and second regulating valves; an auxiliary hopper attached to the ore discharge hopper and an inert gas; A third regulating valve provided in the piping system connecting the supply source, a fourth regulating valve provided in the piping system connecting the auxiliary hopper and the exhaust gas treatment device, the internal pressure of the auxiliary hopper, and the internal pressure of the ore discharge hopper. The annular moving grate type heat exchange device is characterized in that it is equipped with a second gas pressure regulator that detects and controls the third and fourth regulating valves.

Now, the configuration of the device of the present invention is characterized by an ore feeding section and an ore discharge section, and the other configurations are shown in Figs. 1 and 2.
Since the configuration is the same as that of the conventional device shown in the figure, explanation and detailed illustration will be omitted.

In the ore feeding section of the apparatus of the present invention shown in FIG. 3, an auxiliary hopper 14 having dampers 13c and 13a at the loading and unloading ports of the lumps 2 is integrally and airtightly connected upstream of the ore feeding hopper 3. Similarly, in the ore discharge section, dampers 13b are provided downstream of the ore discharge hopper 12 at the charging and unloading ports of the lumps 2, respectively.
An auxiliary hopper 15 having a diameter 13d is provided. The auxiliary hoppers 14 and 15 also have an inert gas source B such as N ₂ gas for equalizing the pressure in the ore feed hopper 3 and the ore discharge hopper 12 which are connected to each other, and the auxiliary hoppers 14 and 15. For example, gas in
It sucks in harmful or flammable gases such as CO and is connected to a gas treatment device C by a piping system having a fan and a regulating valve V.

The regulating valve V is connected to the supply and discharge ore hoppers 3 and 1.
2 pressures P ₁ and P ₃ and the pressures P ₂ and P ₄ of the auxiliary hoppers 14 and 15 attached thereto are detected, and both become equal pressures (P ₁ = P ₂ , P ₃ = P ₄ ). operated by gas pressure regulators 16 and 17 which issue commands to
Its opening degree is automatically adjusted.

In the present invention, the ore supply and discharge hopper 3, 12
The internal pressure is detected and each auxiliary hopper 14, 15
The gas pressure adjustment system that equalizes the internal pressure is collectively referred to as gas pressure adjustment means.

Now, to describe the operation of charging the lumps 2 into the present apparatus, the high-temperature lumps 2 that have been transported by a carrier (not shown) are charged into the auxiliary hopper 14. At this time, the damper 13c at the loading port is open, and the damper 13a at the unloading port is closed. When charging is completed, the damper 13c of the charging port is closed, and the auxiliary hopper 14 is brought into a sealed state. After that, the pressure P ₁ inside the feed hopper 2 and the pressure P ₂ inside the auxiliary hopper 14 are equalized, or the pressure P ₂ of the latter is determined from the pressure P ₁ of the former by the difference in height between the installation positions of both hoppers 3 and 14. After adjusting the pressure by the gas pressure adjusting means so that the pressure is increased by the amount of the draft, the outlet damper 13a of the auxiliary hopper 14 is opened, and the
The lumps 2 temporarily stored therein are dropped into the ore feed hopper 3. In addition, if it is necessary to prevent atmospheric air from entering the auxiliary hopper 14,
After receiving the lumps 2 into the hopper 14, the damper 13c at the charging port is closed to seal the hopper 14, and the inert gas source B and the gas system of the gas treatment device C are activated to remove the hopper 14. After first purging the gas containing air, the pressure equalization operation of the internal pressures of the ore feed hopper 3 and the auxiliary hopper 14 and the operation of charging and transferring the lumps 2 may be carried out in the manner described above. The ore discharge operation using the ore discharge hopper 12 and the auxiliary hopper 15 in the ore discharge section is performed in the same manner as the operation in the ore supply section, and after equalizing the pressure in both hoppers 12 and 15,
The lumps 2 in the first ore discharge hopper 12 are moved into the auxiliary hopper 15, the upper damper 13b is closed to cut off the intrusion of outside air or the leakage of cooling gas, and then the lower damper 13d is opened and the atmosphere Perform an operation to remove the lumps inside.

By doing so, the operation of charging or discharging the lumps 2 onto the annular movable grate 1 can be carried out in a state where they are isolated from the atmosphere and without causing fluctuations in the atmospheric pressure, so that the cooling gas flow path can be Not only can normal operating conditions be maintained without causing any disturbance to the engine, but it is also extremely effective in preventing dangers due to the release of harmful gases into the atmosphere or the intrusion of air.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventionally known annular moving grate type heat exchange device, Fig. 2 is a vertical sectional view taken along line A in Fig. 1 and developed, and Fig. 3 is the same as Fig. 2. 1 is a longitudinal sectional view of a corresponding embodiment of the device according to the invention; FIG. 1... annular moving grate, 2... lumps, 3...
Ore feeding hopper, 4...Seal mechanism, 5a, 5b,
5c... Cooling room, 12... Ore hopper, 13
a, 13b, 13c, 13d...damper, 1
4,15...Auxiliary hopper, B...Inert gas source, C...Harmful gas treatment device, _P1 to _P5 ...Gas pressure at each part, T...Pallet, V...Gas control valve.

Claims (1)

[Claims] 1. High-temperature lumps such as red-hot coke are loaded from the feed hopper to a certain layer thickness onto a moving annular grate made up of a number of pallets that run in an annular space cut off from the outside air. In the annular moving grate type heat exchange device, the lumps cooled by the cooling gas that crosses the layer are discharged from the ore hopper, and the lumps are discharged into each of the feed hopper and the discharge hopper. An auxiliary hopper is attached to temporarily store the ore, and an airtight damper is provided at each of the lump loading and unloading ports of the auxiliary hopper, and the auxiliary hopper attached to the feeding hopper and the inert gas supply The first regulating valve is installed in the piping system connecting the source, and the second regulating valve is installed in the piping system connecting the auxiliary hopper and the exhaust gas treatment device.
a first gas pressure regulator that detects the internal pressure of the auxiliary hopper and the internal pressure of the ore feed hopper and controls the first and second regulating valves, an auxiliary hopper attached to the ore discharge hopper; A third regulating valve installed in the piping system connecting the inert gas supply source, a fourth regulating valve installed in the piping system connecting the auxiliary hopper and the exhaust gas treatment device, and controlling the internal pressure of the auxiliary hopper and the discharged ore. 1. An annular moving grate type heat exchange device, comprising a second gas pressure regulator that detects the internal pressure of the hopper and controls the third and fourth regulating valves.